Extension-plug.



No. 670,376. Patented Mar. l9, I90l. P. H. uumn.

EXTENSION PLUG.

(Application filed June 11, 1900.

(No Mod 0].)

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ATENT PATRICK HENRY QUINN, OF PASADENA, CALIFORNIA.

EXTENSlON -PLUG.

SPECIFICATION forming part of Letters Patent No. 670,376, dated. March19, 1901.

Application filed June 11,1900. Serial No. 19,957. .No model.)

To all whom it may concern.-

Be it known that I, PATRICK HENRY QUINN, a citizen of the United States,residing at Pasadena, in the county of Los Angeles, State of California,have invented new and useful Improvements in Extensible Plugs, of whichthe following is a specification.

My invention relates to removable plugs screwed into the stationaryfixture to make contact between such fixture and wires connected to anelectric lamp; and the object thereof is to provide a simple fixturethat when screwing the plug to the fixture will not twist the wire. Iaccomplish this object by the device described herein and illustrated inthe accompanying drawings, in which- Figure l is a side elevation of theplug containing my invention adapted to be screwed into the stationaryfixture. Fig. 2 is a central vertical section of the same. Fig. 3 is across-section on line 3 3 of Fig. 2, the disk, bushing, and screwremoved. I

Referring to the drawings, A is a threaded metallic casing adapted to bescrewed into the socket of the stationary fixture, around the upper endof which is an exterior ring B, of insulating material. In the lower endof easing A is rigidly affixed disk C, also of insulating material,having an aperture in the center thereof through which passes bushing D,rotatable therein. Bushing D is fastened to bar E by screw G and formsone point of electric contact with the permanent fixture when the plugis in use. piece H by screw P. Casing A is rotatable around thumb-piecel-Lwhich is provided with an aperture H, through which passes insulatedwires 1 and J that connect with the lamp. (Not shown.) Wire I is alsoconnected with bar E. To thumb-piece H is affixed a spring K, adapted tocontact with casing A. Spring K is connected with wire J by fuse-wire Land the ordinary fuse-terminals M and N, which form attachingconnections. When it is desired to attach the plug to a stationaryfixture, casing A is placed in position to be screwed into the socket.With one hand the operator holds thumb-piece H against rota- Bar E isfastened to thumbtion and with the other hand rotates casing A untilbushing D reaches the bottom of the socket in the stationaryfixture,when the plug is attached and the lamp is ready for use. As thewires which connect with the lamp are attached to thumb-piece H, whichdoes not rotate, all twisting of the wires is avoided and the plug isattached easily to the fixture,

Having described my invention, what I claim is 1. A removable plug forconnecting the wires of an incandescent electric lamp to a stationaryfixture, comprising a threaded metallic casing, surrounded at its upperend by a ring of insulating material, a disk of insulating materialaffixed to said casing within the lower end thereof, a bar rot-ativelyconnected with said disk at one end, and rigidly connected at its otherend with a thumbpiece; athumb-piece of insulating material in the upperend of said casing; a metallic spring affixed to said thumb-piece,adapted to contact with said metallic casing, and connections adapted toconnect one wire leading to the lamp with said spring, and the otherwire with said bar.

2. A removable plug for connecting the wires of an incandescent electriclamp, comprising a threaded metallic casing having an.

insulated cover around the upper part thereof, and an apertured disk ofinsulating material within the lower part, adapted to be rotated arounda thumb-piece; a thumb-piece of insulating material; a metallic barconnected to said thumb-piece; a rotatable bushing, in the aperture inthe disk of the casing, attached to said bar; a spring affixed to saidthumb-piece adapted to contact with the easing; and. means to connectthe wires of an incandescent lamp, one wire to the spring, and the otherto the bar.

In witness that I'claim the foregoing I have hereunto subscribed myname, this 4th day of June, 1900, at Los Angeles, California.

PATRICK HENRY QUINN.

Witnesses:

G. E. HARPHAM, HENRY T. HAZARD.

